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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f021dfa3f0231df04632eb75eb024d9cb9101ad9a854ec00a84a9a230ff570' 
  AND token = 'mueu9xz9DZl6Hn3SFmc5v1ADrag3c7YHBahLz2wAxPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}